cproj, cprojf, cprojl - project into Riemann Sphere
double complex cproj(double complex
float complex cprojf(float complex
long double complex cprojl(long double complex
These functions project a point in the plane onto the surface of a
Riemann Sphere, the one-point compactification of the complex plane.
Each finite point
z projects to
z itself. Every
complex infinite value is projected to a single infinite value, namely
to positive infinity on the real axis.
These functions first appeared in glibc in version 2.1.
C99, POSIX.1-2001, POSIX.1-2008.
In glibc 2.11 and earlier, the implementation does something
stereographic projection onto a Riemann
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